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{
"cells": [
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "U9i2Dsh-ziXr"
},
"source": [
"# Eager Execution Tutorial: Importing Data\n",
"\n",
"This notebook demonstrates the use of the [`tf.data.Dataset` API](https://www.tensorflow.org/guide/datasets) to build pipelines to feed data to your program. It covers:\n",
"\n",
"* Creating a `Dataset`.\n",
"* Iteration over a `Dataset` with eager execution enabled.\n",
"\n",
"We recommend using the `Dataset`s API for building performant, complex input pipelines from simple, re-usable pieces that will feed your model's training or evaluation loops.\n",
"\n",
"If you're familiar with TensorFlow graphs, the API for constructing the `Dataset` object remains exactly the same when eager execution is enabled, but the process of iterating over elements of the dataset is slightly simpler.\n",
"You can use Python iteration over the `tf.data.Dataset` object and do not need to explicitly create an `tf.data.Iterator` object.\n",
"As a result, the discussion on iterators in the [TensorFlow Guide](https://www.tensorflow.org/guide/datasets) is not relevant when eager execution is enabled."
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "z1JcS5iBXMRO"
},
"source": [
"# Setup: Enable eager execution\n"
]
},
{
"cell_type": "code",
"execution_count": 0,
"metadata": {
"cellView": "code",
"colab": {
"autoexec": {
"startup": false,
"wait_interval": 0
}
},
"colab_type": "code",
"id": "RlIWhyeLoYnG"
},
"outputs": [],
"source": [
"# Import TensorFlow.\n",
"import tensorflow as tf\n",
"\n",
"# Enable eager execution\n",
"tf.enable_eager_execution()"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "H9UySOPLXdaw"
},
"source": [
"# Step 1: Create a source `Dataset`\n",
"\n",
"Create a _source_ dataset using one of the factory functions like [`Dataset.from_tensors`](https://www.tensorflow.org/api_docs/python/tf/data/Dataset#from_tensors), [`Dataset.from_tensor_slices`](https://www.tensorflow.org/api_docs/python/tf/data/Dataset#from_tensor_slices) or using objects that read from files like [`TextLineDataset`](https://www.tensorflow.org/api_docs/python/tf/data/TextLineDataset) or [`TFRecordDataset`](https://www.tensorflow.org/api_docs/python/tf/data/TFRecordDataset). See the [TensorFlow Guide](https://www.tensorflow.org/guide/datasets#reading_input_data) for more information."
]
},
{
"cell_type": "code",
"execution_count": 0,
"metadata": {
"cellView": "code",
"colab": {
"autoexec": {
"startup": false,
"wait_interval": 0
}
},
"colab_type": "code",
"id": "WPTUfGq6kJ5w"
},
"outputs": [],
"source": [
"ds_tensors = tf.data.Dataset.from_tensor_slices([1, 2, 3, 4, 5, 6])\n",
"\n",
"# Create a CSV file\n",
"import tempfile\n",
"_, filename = tempfile.mkstemp()\n",
"with open(filename, 'w') as f:\n",
" f.write(\"\"\"Line 1\n",
"Line 2\n",
"Line 3\n",
" \"\"\")\n",
"ds_file = tf.data.TextLineDataset(filename)\n"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "twBfWd5xyu_d"
},
"source": [
"# Step 2: Apply transformations\n",
"\n",
"Use the transformations functions like [`map`](https://www.tensorflow.org/api_docs/python/tf/data/Dataset#map), [`batch`](https://www.tensorflow.org/api_docs/python/tf/data/Dataset#batch), [`shuffle`](https://www.tensorflow.org/api_docs/python/tf/data/Dataset#shuffle) etc. to apply transformations to the records of the dataset. See the [API documentation for `tf.data.Dataset`](https://www.tensorflow.org/api_docs/python/tf/data/Dataset) for details."
]
},
{
"cell_type": "code",
"execution_count": 0,
"metadata": {
"cellView": "code",
"colab": {
"autoexec": {
"startup": false,
"wait_interval": 0
}
},
"colab_type": "code",
"id": "ngUe237Wt48W"
},
"outputs": [],
"source": [
"ds_tensors = ds_tensors.map(tf.square).shuffle(2).batch(2)\n",
"ds_file = ds_file.batch(2)"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "IDY4WsYRhP81"
},
"source": [
"# Step 3: Iterate\n",
"\n",
"When eager execution is enabled `Dataset` objects support iteration.\n",
"If you're familiar with the use of `Dataset`s in TensorFlow graphs, note that there is no need for calls to `Dataset.make_one_shot_iterator()` or `get_next()` calls."
]
},
{
"cell_type": "code",
"execution_count": 0,
"metadata": {
"colab": {
"autoexec": {
"startup": false,
"wait_interval": 0
},
"base_uri": "https://localhost:8080/",
"height": 153
},
"colab_type": "code",
"executionInfo": {
"elapsed": 388,
"status": "ok",
"timestamp": 1525154629129,
"user": {
"displayName": "",
"photoUrl": "",
"userId": ""
},
"user_tz": 420
},
"id": "lCUWzso6mbqR",
"outputId": "8e4b0298-d27d-4ac7-e26a-ef94af0594ec"
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Elements of ds_tensors:\n",
"tf.Tensor([1 9], shape=(2,), dtype=int32)\n",
"tf.Tensor([16 25], shape=(2,), dtype=int32)\n",
"tf.Tensor([ 4 36], shape=(2,), dtype=int32)\n",
"\n",
"Elements in ds_file:\n",
"tf.Tensor(['Line 1' 'Line 2'], shape=(2,), dtype=string)\n",
"tf.Tensor(['Line 3' ' '], shape=(2,), dtype=string)\n"
]
}
],
"source": [
"print('Elements of ds_tensors:')\n",
"for x in ds_tensors:\n",
" print(x)\n",
"\n",
"print('\\nElements in ds_file:')\n",
"for x in ds_file:\n",
" print(x)"
]
}
],
"metadata": {
"colab": {
"collapsed_sections": [],
"default_view": {},
"name": "Eager Execution Tutorial: Importing Data",
"provenance": [],
"version": "0.3.2",
"views": {}
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
